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Quick Details

  • Type: Evacuated Tube
  • Pressure: Unpressurized
  • Circulation Type: Direct / Open Loop (Active)
  • Heating System: Thermosyphon (Passive)
  • Connection Type: Direct-Plug
  • Installation: Freestanding
  • Housing Material: Stainless Steel
  • Certification: CE
  • Capacity: 200
  • Place of Origin: China (Mainland)
  • Brand Name: Ontek/OEM
  • Model Number: TJNP-SS

Packaging & Delivery

Packaging Details samples: wooden cases
containers: cartons
Delivery Time 5days/sample, 7days/20', 10days/40'

              With assistant tank stainless steel solar water heater

Technical parameter:


      1.Inner water tank: SUS304-2B stainless steel, 0.31mm-0.51mm thickness

      2.Outer water tank: Color coated steel, 0.31-0.41mm thickness

      3.Insulation layer: Polyurethane foam, 30-60mm thickness

      4.Tank capacity: 60-300L

      5.Logo: OEM/Ontek

Vacuum tubes:

       Category: tri-element tubes/purple gold tubes/common tubes


       Material: Borosilicate glass 3.3

       Absorptive coating:Grade ALN/AIN-SS/CU , Grade ALN/AL


     1.Frame: Galvanized steel, 0.8-1.4mm thickness/Stainless steel 201- 0.31mm thickness/Aluminum alloy

     2.Frame angle: 20-58 degree


     1.Tube at high temperature with magnetic Force

      2.A long time of heat preservation

     3.Stable and reliable performance, well wind resistance

     4.Patent protected collision from the side bracket resistant design

     5.Meeting the requirement of washing clothes, abstersion and design

     6.Dual purpose brackets for both flat and inclined roof

     7.Meeting the demand of well-to-do families

     8.Economic goods surpass their money  

Evacuated tubes Working principle

The selective coating on the inner cover of the evacuated tubes converts solar energy into heat energy and water in the evacuated tubes the heat. When temperature rises along with density drops, and weight goes down, hot water will go up to exchange with cold water in tank. In this way , the temperature of the water in tank goes up.We can use hot water for washing , bathing,swimming,etc. 

How to work

The basic non-pressure system solar water heater is a passive system, which relies on a 

  natural principle-thermosiphon.

There is water in evacuated tubes and free to flow into tanks.When the water in tubes is

  heated by suns rays firstly,this makes water in the tubes lighter. 

Therefore the cold water in the tank move downwards and hotter water move upside into the tank.It is an open circuit since the air vent and the overflow pope is open to the air.

All the storage tanks are tested before leaving with tested pressure of 0.05MPa(0.5bar).But the operation pressure should be 0 MPa.

The daily efficiency is over or equal to 50% normally and 42% in winter. 

We welds the inner tank by high-frequency ring or argon arc techniques.



    intelligent controller

Advantage:automatic supplying water into the tank when the water in the tank is below a certain value.Also,other functions includes water temperature,water level display, auto power-off the electronic heating device.

    Assistant Tank

Advantage:Automatic supply water is conducted through mechanical way by installing an assistant tank (5L,8L,10L).In addition,combined valve could mix hot water with loading cold water fully,preventing shower water now hot now cold.

    Electric Heater  

If cloudy days, the electric heater could heat the water inside water tank, work by manual or controller

    Magnesia bar

If the water is hard in your area, you may need to put this inside water tank to clean the water tank

    Electric magnetic valve

 This is the same function as assistant tank, fill in cold water to water tank


    More information please contact us:




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